Genre and place in the book. A direct continuation of the pair on harm (see 04-07): 4.7 showed that "harm" is constituted by judgement; 4.8 supplies the criterion — what is to count as harm at all. This is the doctrine of invulnerability (DOGMAno-harm-to-virtuous).

The logic. Ὃ χείρω αὐτὸν… ἄνθρωπον οὐ ποιεῖ — "that which does not make a man worse as a man" — also does not make his life (βίος) worse, and does not DOGMAharm him. The tacit premise is the Stoic value-theory: a person's only good is his moral character (virtue), his only evil vice (cf. virtue-is-sufficient). Harm, then, is whatever degrades the character; and only one's own assent to the bad degrades it. The external — wealth, illness, another's act — does not make you a χείρων ἄνθρωπος, and so does not harm you.

ἔξωθεν / ἔνδοθεν. Harm is excluded from both directions: neither "from without" (circumstances, the deeds of others) nor "from within" (bodily states, pain) damages you so long as the moral centre is intact. The only real source of "the worse" is one's own ruling part, should it yield — but that is no longer "harm from outside," it is self-injury, and it lies wholly within one's own power (cf. dichotomy-of-control).

The twin, 2.11. An almost verbatim formula — Med. 2.11: "that which does not make a man worse, how can it make his life worse?" Unfolded in Med. 4.49: nothing that happens prevents one from remaining just and prudent — "happy am I, for I am not crushed by the present nor afraid of the future."

Link with 4.7. The pair forms a complete argument: the external does not harm (4.8), and the "harm" we see in it is our own judgement (4.7). One can take away the judgement (Ἆρον τὴν ὑπόληψιν) precisely because there was no harm to begin with.

The disciplines. The principal one is assent: 4.8 is a judgement about what harm is. The secondary is desire: from it follows not fearing the external nor recoiling from it as an "evil."

Parallels. Only moral worsening is harm — Med. 2.11; 4.49; 7.16; 8.41. The invulnerability of the good person — Plato Apol. 30c–d; 41d; Seneca De const. sap.; Epictetus Ench. 5. The companion on harm-as-judgement — 04-07; Med. 4.39; 8.47. The value-theory (the only good is virtue) — cf. virtue-is-sufficient; DL 7.101–103.